[alberg30] Re: Motor mounts

[RABBIT649 at aol.com]

From: RABBIT649 at aol.com

Dear Gordon,
	Thank you for enriching my knowledge of CV joints. I think I know what a
'Ford cross and trunion' is and a rubber donut but I'm going to have to
research the Rzeppa. The ads I read claimed a high efficiency for this joint,
but of course you're right: you can't contravene the laws of physics and
geomentry.
Regards
Paul
Ashwagh #23



In a message dated 3/22/99 10:16:41 AM Eastern Standard Time,
gewhite at crosslink.net writes:

> From: "Gordon E. White" <gewhite at crosslink.net>
>  
>     Remember that even with a universal joint (a Constant Velocity joint
>  is just a special kind of U-joint that allows more angular displacement
>  than the older versions like the Ford cross and trunion, the rubber
>  donut, the Rzeppa joint, etc.) you lose power when you have any bend in
>  a drive line. Also, with a u-joint where there is any deflection you
>  need a way to handle the inherent if  minute variations in length. With
>  a solid joint there needs to be a spline on the shaft at one end. The
>  rubber versions inherently allow some length flexibility. There is
>  probably no need for a full constant velocity joint per se in a boat
>  except with maybe an outdrive that can be adjusted through a
>  considerable arc, but any displacement from true is going to use up
>  power.
>      It is probably comforting to have a joint that eliminates the
>  problem of the shaft whipping in the cutlass bearing because a little
>  misalignment at the engine becomes a lot at the bearing, but even so,
>  engine alignment should be pretty accurate.
>  
>                                  - Gordon White A-275
>  

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